Remove AbstractVisitor.

dart/lib/compiler/implementation/tree/prettyprint.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * Pretty-prints Node tree in XML-like format.
  *
  * TODO(smok): Add main() to run from command-line to print out tree for given
  * .dart file.
  */
@@ skipping 198 matching lines @@
 
   visitLabel(Label node) {
     visitNodeWithChildren(node, "Label");
   }
 
   visitLabeledStatement(LabeledStatement node) {
     visitNodeWithChildren(node, "LabeledStatement");
   }
 
   // Custom.
-  visitLiteral(Literal node, String type) {
+  printLiteral(Literal node, String type) {
     openAndCloseNode(node, type, {"value" : node.value.toString()});
   }
 
   visitLiteralBool(LiteralBool node) {
-    visitLiteral(node, "LiteralBool");
+    printLiteral(node, "LiteralBool");
   }
 
   visitLiteralDouble(LiteralDouble node) {
-    visitLiteral(node, "LiteralDouble");
+    printLiteral(node, "LiteralDouble");
   }
 
   visitLiteralInt(LiteralInt node) {
-    visitLiteral(node, "LiteralInt");
+    printLiteral(node, "LiteralInt");
   }
 
   /** Returns token string value or [null] if token is [null]. */
   tokenToStringOrNull(Token token) => token === null ? null : token.stringValue;
 
   visitLiteralList(LiteralList node) {
     openNode(node, "LiteralList", {
       "constKeyword" : tokenToStringOrNull(node.constKeyword)
     });
     visitChildNode(node.typeArguments, "typeArguments");
     visitChildNode(node.elements, "elements");
     closeNode();
   }
 
   visitLiteralMap(LiteralMap node) {
     visitNodeWithChildren(node, "LiteralMap");
   }
 
   visitLiteralMapEntry(LiteralMapEntry node) {
     visitNodeWithChildren(node, "LiteralMapEntry");
   }
 
   visitLiteralNull(LiteralNull node) {
-    visitLiteral(node, "LiteralNull");
+    printLiteral(node, "LiteralNull");
   }
 
   visitLiteralString(LiteralString node) {
     openAndCloseNode(node, "LiteralString",
         {"value" : node.token.slowToString()});
   }
 
   visitModifiers(Modifiers node) {
     visitNodeWithChildren(node, "Modifiers");
   }
@@ skipping 122 matching lines @@
     visitChildNode(node.type, "type");
     visitChildNode(node.modifiers, "modifiers");
     visitChildNode(node.definitions, "definitions");
     closeNode();
   }
 
   visitWhile(While node) {
     visitNodeWithChildren(node, "While");
   }
 }